WaterFlush/Assets/Scripts/WeatherTool.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public enum WeatherType
{
    sun,
    rain,
    snow
}
public class WeatherTool : MonoBehaviour
{
    public WeatherType _CurrentWeatherType;
    public GameObject _flare;
    public ParticleSystem rain;
    public ParticleSystem snow;

    public static WeatherTool instance;
    private void Awake()
    {
        instance = this;
    }
    // Update is called once per frame
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Alpha1))
        {
            _CurrentWeatherType = WeatherType.sun;
            UpdateWeather();
        }
        if (Input.GetKeyDown(KeyCode.Alpha2))
        {
            _CurrentWeatherType = WeatherType.rain;
            UpdateWeather();
        }
        if (Input.GetKeyDown(KeyCode.Alpha3))
        {
            _CurrentWeatherType = WeatherType.snow;
            UpdateWeather();
        }
    }

    public void UpdateWeather()
    {
        var rainEmission = rain.emission;
        var snowEmission = snow.emission;

        switch (_CurrentWeatherType)
        {
            case WeatherType.sun:
                _flare.SetActive(true);
                rainEmission.rateOverTime = 0;
                snowEmission.rateOverTime = 0;
                break;
            case WeatherType.rain:
                _flare.SetActive(false);
                rainEmission.rateOverTime = 1000;
                snowEmission.rateOverTime = 0;
                break;
            case WeatherType.snow:
                _flare.SetActive(false);
                rainEmission.rateOverTime = 0;
                snowEmission.rateOverTime = 1000;
                break;
        }
    }
}